(Unicode C) Backblaze S3 List Bucket Objects

See more Backblaze S3 Examples

Demonstrates how to list the objects in a bucket.

The Chilkat S3 functions in the HTTP class are compatible with the Backblaze service. However, because of some specific issues, Chilkat v9.5.0.89 or later is needed.

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#include <C_CkHttpW.h>
#include <C_CkXmlW.h>

void ChilkatSample(void)
    {
    HCkHttpW http;
    const wchar_t *bucketName;
    const wchar_t *strXml;
    HCkXmlW xml;
    BOOL success;
    const wchar_t *ETag;
    const wchar_t *Key;
    const wchar_t *LastModified;
    const wchar_t *ID;
    const wchar_t *SizeDecimalStr;
    const wchar_t *StorageClass;
    const wchar_t *ListBucketResult_xmlns;
    int i;
    int count_i;
    const wchar_t *IsTruncated;
    int MaxKeys;
    const wchar_t *Name;

    // This example assumes the Chilkat HTTP API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    http = CkHttpW_Create();

    // keyID = Access Key ID or Access Key
    CkHttpW_putAwsAccessKey(http,L"access-key");

    // applicationKey = Secret Access Key or Secret Key
    CkHttpW_putAwsSecretKey(http,L"secret-key");

    // Region is the 2nd part of your S3 Endpoint
    CkHttpW_putAwsEndpoint(http,L"s3.us-west-002.backblazeb2.com");

    bucketName = L"chilkat-test";

    strXml = CkHttpW_s3_ListBucketObjects(http,bucketName);
    if (CkHttpW_getLastMethodSuccess(http) != TRUE) {
        wprintf(L"%s\n",CkHttpW_lastErrorText(http));
        CkHttpW_Dispose(http);
        return;
    }

    wprintf(L"Response status code = %d\n",CkHttpW_getLastStatus(http));

    xml = CkXmlW_Create();
    success = CkXmlW_LoadXml(xml,strXml);
    if (success != TRUE) {
        wprintf(L"%s\n",CkXmlW_lastErrorText(xml));
        CkHttpW_Dispose(http);
        CkXmlW_Dispose(xml);
        return;
    }

    // If the response status code was not 200, then the XML response is not a 
    // listing of objects, but instead contains error information.
    if (CkHttpW_getLastStatus(http) != 200) {
        wprintf(L"%s\n",CkXmlW_getXml(xml));
        wprintf(L"Failed.\n");
        CkHttpW_Dispose(http);
        CkXmlW_Dispose(xml);
        return;
    }

    // A sample response is shown below.
    wprintf(L"%s\n",CkXmlW_getXml(xml));
    wprintf(L"----\n");

    // Use this online tool to generate parsing code from sample XML: 
    // Generate Parsing Code from XML

    // <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
    // <ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
    //     <Contents>
    //         <ETag>"303fb46cf341094fef6274b7789cd6aa"</ETag>
    //         <Key>orchard.json</Key>
    //         <LastModified>2021-10-30T14:45:52.000Z</LastModified>
    //         <Owner>
    //             <ID>f2ebbc5f792c</ID>
    //             <DisplayName/>
    //         </Owner>
    //         <Size>22</Size>
    //         <StorageClass>STANDARD</StorageClass>
    //     </Contents>
    //     <Contents>
    //         <ETag>"a8551f0a5437f43a796fca7623ee9232"</ETag>
    //         <Key>seahorse.jpg</Key>
    //         <LastModified>2021-10-30T14:38:53.000Z</LastModified>
    //         <Owner>
    //             <ID>f2ebbc5f792c</ID>
    //             <DisplayName/>
    //         </Owner>
    //         <Size>24388</Size>
    //         <StorageClass>STANDARD</StorageClass>
    //     </Contents>
    //     <IsTruncated>false</IsTruncated>
    //     <MaxKeys>1000</MaxKeys>
    //     <Name>chilkat-test</Name>
    //     <Prefix/>
    //     <Marker/>
    // </ListBucketResult>

    ListBucketResult_xmlns = CkXmlW_getAttrValue(xml,L"xmlns");
    i = 0;
    count_i = CkXmlW_NumChildrenHavingTag(xml,L"Contents");
    while (i < count_i) {
        CkXmlW_putI(xml,i);
        ETag = CkXmlW_getChildContent(xml,L"Contents[i]|ETag");
        Key = CkXmlW_getChildContent(xml,L"Contents[i]|Key");
        LastModified = CkXmlW_getChildContent(xml,L"Contents[i]|LastModified");
        ID = CkXmlW_getChildContent(xml,L"Contents[i]|Owner|ID");
        SizeDecimalStr = CkXmlW_getChildContent(xml,L"Contents[i]|Size");
        StorageClass = CkXmlW_getChildContent(xml,L"Contents[i]|StorageClass");
        i = i + 1;
    }

    IsTruncated = CkXmlW_getChildContent(xml,L"IsTruncated");
    MaxKeys = CkXmlW_GetChildIntValue(xml,L"MaxKeys");
    Name = CkXmlW_getChildContent(xml,L"Name");


    CkHttpW_Dispose(http);
    CkXmlW_Dispose(xml);

    }